Backpack



FIG. 1 is a front elevational view of a backpack showing my new design; the broken lines on the surface of the pack throughout the views being understood to represent stitching. And the broken lines showing a handle in FIGS. 1-6 illustrate the portion of the design that forms no part of the claim.

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof, with the latch open;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof. 

The ornamental design for a backpack, as shown and described. 